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Enzyme electrophoresis, sero- and subtyping, and outer membrane protein characterization of two Neisseria meningitidis strains involved in laboratory-acquired infections.

Centre National de Référence des Méningocoques et Neisseria apparentées (CNRM), Institut Pasteur, Paris, France.

ABSTRACT

Two cases of laboratory-acquired infections due to Neisseria meningitidis were suspected to have occurred in two French hospitals. The first case occurred shortly, i.e., 3 days, after one strain had been handled by a laboratory technician, and the link between this strain and the strain causing meningitis was easily established. In the second case, infection occurred 3 weeks after 10 strains had been handled by a technician. In this case, it was necessary to use high-resolution markers in order to establish the link between the infecting strain and 1 of the 10 strains handled. The antigenic formulae of the two infecting strains (serogroup:serotype:subtype) were, respectively, C:NT:P1.12 and B:2a:P1.2. Outer membrane protein profile analysis and multilocus enzyme electrophoresis unequivocally confirmed the identity of the respective strains.

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